Sleep also plays an integral role in regulating the body’s immune system, which is responsible for fighting off all sorts of problems from the common cold to more serious chronic problems like cancer. Sleep is also when our muscles repair damage (and regular wear and tear) from throughout the day. There’s an increase in the release of growth hormones during sleep (this is when kids get taller, our skin cells regenerate, and our hair gets longer), as well as the hormones that regulate appetite. Our heart rate and body temperatures drop, our breathing rate slightly decreases and becomes very regular (at least during most stages of sleep), and kidney function slows down (which is why you typically don’t feel the urge to pee as frequently during sleep as when you’re awake).Īnd at the same time, other systems in the body ramp way up during sleep. Outside of the brain, there’s a lot changing throughout the rest of the body during sleep, too.
Not getting sleep can literally make you sick Another study found that after a week of getting just four-and-a-half hours of sleep per night, individuals reported worse moods (in terms of feeling stressed, angry, sad or mentally exhausted).
Chronic insomnia has also been linked to increased risk of developing a mood disorder, including anxiety or depression.
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